Enhanced afterglow performance of Zn2SiO4:Mn2+ by Pr3+ doping and mechanism

Pang

et al. 2023

ACS Appl. Nano Mater.

Photostimulable luminescence (PSL) nanophosphors, which exhibit superior features including controllable energy storage and efficient photon release upon light stimulation, are desirable for optical signal storage. However, trap tuning of the storage phosphor remains a great challenge. Herein, the PSL of Zn2GeO4:Mn2+ nanophosphors is enhanced via creating deep traps through nonequivalent Pr3+ doping. The possible enhanced mechanisms are analyzed combined with doping models using the first-principles theory. A mechanism is proposed based on changing the coordination environment of Mn2+, creating deep traps and tuning the band gap structure, and thus providing the chance for electrons’ photoionization and PSL generation. As a result, the prepared nanophosphors demonstrate the superior functionalities for optical signal storage. This work not only offers an insight into defect engineering through doping strategies for developing PSL materials but also supplies a good candidate for optical information storage.

Section: Resultssupporting

confidence: 92%

Section: Photoluminescence Propertiesmentioning

confidence: 99%

Mn²⁺-Activated Photostimulable Persistent Nanophosphors by Pr³⁺ Codoping for Rewritable Information Storage

Pang

et al. 2023

ACS Appl. Nano Mater.

“…When the external energy stops irradiating, the stored energy can be slowly released in the form of light to achieve non-electric luminescence; therefore, it is also known as luminous material [1,2]. At present, several green long afterglow phosphors with excellent persistence properties have been reported such as SrAl 2 O 4 :Eu 2+ ,Dy 3+ [3], Li 2 MgGeO 4 :Mn 2+ [4], Ca 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ [5], Ba 2 SiO 4 :Eu 2+ ,Ho 3+ [6], Ga 4 GeO 8 :Tb 3+ [7], Sr 3 Ga 4 O 9 :Tb 3+ [8], and Zn 2 SiO 4 :Mn 2+ ,Pr 3+ [9]. Among them, SrA1 2 O 4 :Eu 2+ ,Dy 3+ is one of the most studied green long afterglow phosphors.…”

Section: Introductionmentioning

confidence: 99%

Sunlight-Activated Long Persistent Luminescent Coating for Smart Highways

Li¹,

Yu²,

Tang³

et al. 2023

Coatings

With the whole society’s demand for intelligence, the smart highway has become the inevitable trend of road development. Luminescent road marking made of long persistent luminescent coating is a new type of functional marking that is designed with long afterglow luminescent material as the raw material and has many features such as safety, beauty and energy saving. Here, SrA12O4:Eu2+,Dy3+ green long afterglow phosphors were prepared using a high-temperature solid state method. The green phosphors obtained at 1350 °C have two traps with a shallow trap depth of 0.66 eV and a deep trap depth of 0.8 eV. The green afterglow can be seen in the dark for more than 8 h after sunlight excitation for 2 h. The green long persistent luminescent coatings were synthesized using the blending method. The uniformity of each component can be improved by adding 1.25% SiO2 into the luminescent coatings. The addition of 3.5% CaCO3 will improve the compactness of the coatings and reduce water absorption. After soaking in water for 120 h, the afterglow intensity of the coating decreases to 76% of the original, showing good water resistance. After daylight excitation in different weather conditions (cloudy, sunny, rainy), the afterglow can reach more than 5 h; therefore, it can be applied to a smart highway.

“…At present, the strategies to improve the PLQY of OIMH compounds are mainly through reducing the crystal structure dimension, doping the luminescence center ion, changing the distance between the coordination polyhedral, and adjusting the structure through halogen substitution [19][20][21]. Among various materials, silicate-based composites have attracted increasing research interests as potentially commercial luminescent materials owing to strong environmental adaptability, reliable chemical inertness, excellent moisture resistance, high brightness, low cost, and facile synthesis [22,23].…”

Section: Introductionmentioning

confidence: 99%

Sheaf-like Manganese-Doped Zinc Silicate with Enhanced Photoluminescence Performance

Li,

Zhang,

et al. 2023

Inorganics

Sheaf-like manganese-doped zinc silicate (Mn-doped Zn2SiO4) was successfully synthesized without surfactant by hydrothermal route using manganese acetate, zinc nitrate, and sodium silicate as precursors. The structure, morphology, and optical properties were well investigated by various analytical techniques, such as X-ray diffraction (XRD), a scanning electron microscope (SEM), a transmission electron microscope (TEM), and photoluminescence (PL). The results showed the enhancement of crystallinity and an increase in the length of the as-prepared sample, which was achieved by prolonging the hydrothermal time. Based on the analysis of the XRD pattern, it can be stated that the sheaf-like Mn-doped Zn2SiO4 possesses a large lattice distortion compared to pure Zn2SiO4. Moreover, it was observed that hydrothermal times played a crucial role in the PL property. The PL peak intensity of samples located at 522 nm generally increased with the increase in reaction time in the range of 12–48 h. However, when the treating time reached 72 h, the property of PL decreased. The results of the PL spectra showed that Mn-doped Zn2SiO4 obtained by a hydrothermal time of 48 h displayed an efficient luminescent performance. The key to the high PL property mainly lies in the sheaf-like structure and large lattice distortion.